Beam pointing error of wideband phased array antennas with reduced true-time-delay devices

Phased array antennas have primarily been used for narrowband systems such as radar. However, in recent years, these systems have been increasingly used for wideband applications, such as satellite communication. In this paper, we describe the beam shift principle of a wideband linear phased array antenna with reduced true-time-delay devices, as well as a simple formula for calculating the beam pointing error. The results obtained from the application of the formula were in concurrence with the simulation results. We also propose a simple method for compensating for the pointing error, and report the simulation results.